December 01 , 2016. EN. Popocatepetl , Turrialba , Nevado Del Ruiz , Chirinkotan .

Home / blog georges Vitton / December 01 , 2016. EN. Popocatepetl , Turrialba , Nevado Del Ruiz , Chirinkotan .

December 01 , 2016. EN. Popocatepetl , Turrialba , Nevado Del Ruiz , Chirinkotan .

December 01 , 2016.


Popocatepetl , Mexico :

30 November 06:00 h (30 November 1200 GMT)

The event that started yesterday at 20h47 ended today at 04h30. This episode was characterized by the emission of a constant column of steam, gas, ashes and fragments of lava. The column reached a maximum height of 1.5 km in a northeasterly direction.


The incandescent fragments emitted from the crater reached a distance of 800 meters on the northeast slope. At present, only a few ash falls are reported in the cities of San Nicolas de los Ranchos in Puebla and San Pablo del Monte and Xicohtzinco in Tlaxcala.

The volcanic alert semaphore of Popocatepetl Volcano is located in Amarillo Phase 2.

November 30 11:10 am (17:10 GMT November 30)

Over the past 24 hours, the Popocatepetl volcano monitoring network has recorded 29 low-intensity exhalations. In addition it was identified 293 minutes of harmonic tremor.



From 8:47 pm yesterday and until 4:35 am today, a constant emission of water vapor, gas, ashes and fragments of lava has been recorded. The column reached an average height of 1.5 km, directed mainly to the northeast. Fragments of lava falling at a distance of 1 km from the crater on the northern slope were observed.

This emission remained constant for 8 hours, the ash cloud generated reached the coast of the Gulf of Mexico, with the record of ash falls in the municipalities of San Nicolas de los Ranchos, Cholula, Puebla, San Andrés Calpan, Huejotzingo , San Martin Texmelucan, in the state of Puebla, and San Pablo del Monte in the state of Tlaxcala.

The following image shows the extent of the ash cloud. This image is obtained by the National Environmental Satellite, data from the National Oceanic and Atmospheric Administration (NOAA) Information Service of the Government of the United States of America.

At the time of this report, continuous emissions of steam, gas with minor amounts of ash persist, moving north-northeast.

Source : Cenapred

Photos : Cenapred , Luis Garcia


Turrialba , Costa Rica :

30 November 2016. 21:30 local time.

After the earthquake of 18:25, local time, 5.5 degrees, more than 100 replicas were recorded, the largest with a magnitude of 4.3 degrees, most of these replicas were felt only by the inhabitants of nearby areas of the epicenter.


The origin of these earthquakes is a local fault, located in the middle of the Irazú and Turrialba volcanoes. Recall that these local faults, located in the central valley, have the capacity to produce earthquakes up to 6 degrees.
In the records of the seismic stations, it is noted that with the hours passing, the quantity and the amplitude of the replicas decreases.
The Ovsicori is still vigilant.

ACTIVITY REPORT of the TURRIALBA volcano, November 30, 2016

During this day, the activity of the Turrialba volcano continued its degassing in the crater . In this period of time was emitted a plume of white color for the exit of the steam, although sometimes the plume assumed a slight greyish color.
The seismicity of the volcano is always maintained at a minimum level of activity where only a signal of background noise and sometimes a low-intensity tremor are observed.

The direction of the winds remained towards the southwest and in the central valley varied from northwest to southwest; The height of the gas plume does not exceed 500 meters.

Source : Ovsicori


Nevado Del Ruiz , Colombia :

Weekly activity bulletin of the volcano Nevado del Ruiz, from 22 November to 28 November, 2016

The level of activity of the volcano continues at the level  activity  yellow or (III): changes in the behavior of the volcanic activity.

As regards the monitoring of the activity of the volcano Nevado del Ruiz, the Colombian Geological Survey reports that:

During the last week, various monitoring parameters show that the Nevado del Ruiz volcano remains unstable. The seismic activity associated with the fracturing of the volcanic rock beneath the volcano showed a decrease in the number of earthquakes and their seismic energy released compared to the previous week. This seismicity was located mainly in the distal North, South and Southeast seismogenic sources and, to a lesser extent, in the northeast and southwest of the volcano, as well as in the Arenas crater . The depths of the earthquakes varied between 0.3 and 7.4 km. The maximum magnitude recorded during the week was 1.7 ML (local magnitude), corresponding to the earthquake recorded on 28 November at 08:48 (local time), located in the Arenas crater, 1.3 km depth. The appearance of a seismic increase recorded on 28 November in the southeastern sector of the Arenas crater with depths varying between 1.3 and 3.1 km is highlighted. The largest earthquakes recorded during this increase were at 9:12 and 12:43 (local time), with a magnitude of 1.2 ML (local magnitude), both at a depth of 3.0 km .



The seismicity related to the dynamics of fluids in the conduits of the volcanic structure has been characterized by the appearance of earthquakes with different energy levels, long period (LP) and very long period (VLP), pulses of Tremors and multiple earthquakes. In addition, episodes of continuous low-energy volcanic tremors were recorded. This type of seismicity was mainly located in the Arenas crater and the southeast sector of the volcano. Some of these seismic signals have been associated with the emission of gases and ash into the atmosphere, as confirmed by images captured by the cameras installed in the volcano region and by reports from officials of Park  Natural National of Los Nevados (Pnnn). The recording of new seismic signals of this type with higher energy levels which may be associated with the emission of gas and ash is not excluded. It is important to remember that these ash emission processes can occur over several days and sometimes several times a day without involving an individual report of each episode.

Volcanic deformation, measured from electronic inclinometers, Global Navigation Satellite Systems (GNSS) and satellite images to determine changes in inclination, position and shape of the volcano, continues to record in the last few months, inflation and intermittent inflation / deflation impulses, possibly linked to gas and ash emissions.


nevado del ruiz

The volcano continues to emit large quantities of water vapor and gases, including sulfur dioxide (SO2), which is distinguished, as evidenced by the values obtained by the SCANDOAS stations installed in the zone of analysis of the volcano and on the satellite image. In the tracking information provided by the Mirova portal, a 5 MW (low level) thermal anomaly was identified on 24 November at 01:40 (local time).

The column of gas, steam and ash from time to time reached a maximum height of 1700 m on the top of the volcano on 26 November. The direction of dispersal of the column was in line with the dominant wind regime in the area, which during the week fluctuated between Southwest, Northwest and Southeast.

The volcano Nevado del Ruiz continues at activity level Amarillo.


Source : SGC

Photos : Archives SGC


Chirinkotan ,  Kouriles Islands , Russia :

48.98°N, 153.48°E
Elevation 724 m

SVERT reported that on 29 November an ash plume rose from Chirinkotan was visible in satellite images rising to an altitude of 8.8 km (29,000 ft) a.s.l. and drifting 39 km N. The Aviation Color Code was raised to Yellow (on a four-color scale).



The small, mostly unvegetated 3-km-wide island of Chirinkotan occupies the far end of an E-W-trending volcanic chain that extends nearly 50 km west of the central part of the main Kuril Islands arc. Chirinkotan is the emergent summit of a volcano that rises 3000 m from the floor of the Kuril Basin. A small 1-km-wide caldera about 300-400 m deep is open to the SE. Lava flows from a cone within the breached crater reached the north shore of the island. Historical eruptions have been recorded at Chirinkotan since the 18th century. Fresh lava flows also descended the SE flank of Chirinkotan during an eruption in the 1880s that was observed by the English fur trader Captain Snow.

Source : GVP

Photo : R. Bulgakov, 1990

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